Amy Weaver
President and Chief Financial Officer at Salesforce
Great. Thank you, Gavin, and hello, everyone. As we discussed two months ago at our Analyst Day, we are in a new world and we showed our ability to execute on this new world once again in Q3. We delivered on key metrics, strong top and bottom line and cash flows. And our focus remains on disciplined and profitable growth. Q3 was also a milestone quarter as it was our first full quarter with Slack. Building on their strong performance over the last several quarters, Slack's early results reinforce our confidence in the strategic importance of this best-in-class asset.
Now let me walk you through some of the results for Q3 fiscal '22 beginning with top line commentary. Total revenue for the third quarter was $6.86 billion, which includes $280 million from Slack. This is up 27% year-over-year or 26% in constant currency. This strong demand environment and new business pipeline that we've highlighted on the last few earnings calls continued, allowing us to outperform top line expectations again.
A few key highlights from the quarter. First launched 22 years ago, Sales Cloud became a $6 billion run rate business this quarter and grew revenue 17%. Sales Cloud now joins Service Cloud, which became a $6 billion business just two quarters ago. And Service Cloud continues to grow over 20% at scale. These are two massive businesses growing in the double-digits and their success is a testament to the strength of our core. Our Americas business is performing extremely well and we see a healthy demand environment in front of us. New business in North America was especially strong, our largest market that we've been operating in for over 20 years.
And as you heard from Bret, Slack continues to outperform our expectations. Slack has strong customer acquisition with notable strength in the enterprise. The number of paid customers spending greater than $100,000 annually accelerated for the fourth consecutive quarter, up 44% year-over-year. Slack Connect adoption remains strong, with the number of connected end points reaching a record level, up 176% year-over-year. And we've been able to introduce Slack to new customers. Already four of our top 10 deals this quarter included a new Slack win.
Once again, we saw strong growth in our multi-cloud deals as our customers continue to ask for more than point solutions. In Q3, we recorded 33% year-over-year growth in the number of deals containing five or more clouds. We did see some headwinds this quarter to our MuleSoft business. When a business is growing as quickly as MuleSoft is, there are scaling challenges you can face and we experienced some of these challenges this quarter. We are confident in the changes that we have made going forward. As a reminder, a large portion of our MuleSoft revenue is recognized in period, which has an outsized impact to our second half revenue. MuleSoft remains a critical part of our Customer 360, allowing our customers to integrate all of their data and systems.
Beginning this quarter with the incorporation of Slack into our financial results, we are providing investors with updated revenue by service offering disclosures. Going forward, Slack will be reported in Platform and Other. We are also creating a new revenue category, Data, which will incorporate MuleSoft and Tableau including Tableau CRM, all of which were previously included in Platform and Other. We believe this will provide greater transparency into our results. A historical recast [Phonetic] using our new revenue breakdown is available in the earnings deck that we have published alongside our press release.
And we continue to make great progress on attrition. For the first time in company history, revenue attrition was below 8%. Q3 attrition was between 7.5% to 8%, an improvement versus last quarter's 8% to 8.5%. Our remaining performance obligation, representing all future revenue under contract, ended Q3 at approximately $36.3 billion, up 20% year-over-year. Current remaining performance obligation or CRPO, which represents all future revenue under contract that is expected to be recognized as revenue in the next 12 months was approximately $18.8 billion, up 23% year-over-year and in constant currency. Slack represents 4 points of growth, in line with our guidance.
Turning to operating margin. Q3 non-GAAP operating margin was 19.8%, which continues to benefit from revenue outperformance, efficiencies from a work-from-anywhere world and a focus on disciplined spending.
Q3 GAAP EPS was $0.47, and non-GAAP EPS was $1.27. The outperformance in the quarter was primarily due to stronger revenue and expense efficiencies as well as realized and unrealized gains on our strategic investment portfolio. These mark-to-market adjustments benefited GAAP EPS by approximately $0.27 and non-GAAP EPS by approximately $0.28.
Turning to cash flow. Operating cash flow in the third quarter was $404 million, up 19% year-over-year. Capex for the quarter was $166 million, resulting in free cash flow of $238 million, up 11% year-over-year.
Now turning to guidance. We expect Q4 revenue of $7.224 billion to $7.234 billion or approximately 24% growth year-over-year. This guidance assumes a $285 million contribution from Slack in the fourth quarter. For the full year, we are raising our fiscal '22 revenue guidance by another $50 million to $26.3 billion to $26.4 billion. This equates to a total $100 million raise to our revenue guidance since Q2. Our guidance now includes $565 million contribution from Slack for the fiscal year. The fiscal year revenue contribution from Slack represents a $35 million increase from our previous guidance. Our full year guidance continues to include $200 million from Acumen. For Q4, we expect to deliver CRPO growth of approximately 19%. This includes 4 points of growth from Slack.
One thing I will call attention to is that we remain mindful of the strengthening US dollar in our foreign operations, which may impact our financials. We continue to monitor foreign exchange as we execute on what is typically the largest quarter in our fiscal year.
We expect Q4 GAAP EPS of negative $0.24 to negative $0.23, and non-GAAP EPS of $0.72 to $0.73. For the full year, this translates to GAAP EPS guidance of $1.28 to $1.29 and non-GAAP EPS guidance of $4.68 to $4.69. We expect recent M&A will be an approximately $0.49 headwind to non-GAAP diluted EPS. And please recall that our OIE and EPS guidance assume no further contribution from loss to mark-to-market accounting as required by ASU 2016-01. We are also raising our fiscal '22 non-GAAP operating margin guidance to 18.6%, representing an expansion of 90 basis points year-over-year. The raise in our operating margin guidance is due to refined assumptions around Slack and Acumen. We now expect a 140 basis point headwind or 10 basis points less headwind than our previous guidance.
I'd like to call out that our guidance continues to incorporate expense seasonality that is weighted to Q4, including investments in both our workforce and growth opportunities and T&E expectations. We are raising fiscal '22 operating cash flow guidance by 4 points, now expecting 18% to 19% growth year-over-year. The increase from our previous guide is primarily driven by strong revenue performance and lower headwinds from M&A. The dilutive cash flow impact of Slack and Acumen now represents a headwind to our year-over-year growth of approximately 5 points. Excluding the anticipated impact of M&A, operating cash flow growth would be 23% to 24%.
We continue to expect capex to be approximately 3% of revenue in fiscal '22, thus resulting in a free cash flow growth rate of approximately 19% to 20% for the fiscal year. Excluding the anticipated impact of M&A as previously noted, this rate would be 25% to 26%. As I shared with you two months ago, it is incredibly important to drive this conscious decision-making in every aspect of the company. This new mindset will enable a more durable company as we approach $50 billion and fiscal '22 represents how we can deliver profitable growth in this new world.
Turning to fiscal '23, we were pleased to provide our initial revenue and non-GAAP operating margin guidance during our Investor Day. Today we are initiating Q1 fiscal '23 revenue guidance of $7.215 billion to $7.25 billion, or approximately 21% to 22% growth year-over-year. As Gavin mentioned, we're off to a strong start in Q4, and we'll provide you with our complete fiscal '23 guidance as part of our Q4 earnings in February.
So to close, our business is performing well, and we continue to see record levels of revenue and operating margin. Our flagship product and in Sales Cloud saw its third consecutive quarter of acceleration and we now have two $6 billion businesses in sales and service. Slack is outperforming our expectations and the integration continues to progress well and we remain incredibly well positioned with our broad product portfolio and global reach to be able to serve all of our customers. Our products are more relevant than ever.
Finally, on a personal note, I want to congratulate both Marc and Bret in their new Co-CEO partnership. I have been privileged to work closely with both of them for many years and I cannot begin to tell you how excited I am for both of them and even more for Salesforce.
So Jeff, why don't I kick it back to you and we can open it up for questions? Jeff, operator?
