Thank you for standing by, and welcome to 8x8's fourth quarter and fiscal year 2025 earnings conference call. At this time, all participants are in a listen-only mode. After the speaker presentation, there will be a question-and-answer session. To ask a question during the session, you will need to press star one one on your telephone. To remove yourself from the queue, you may press star one one again. I would now like to hand the call over to Kate Patterson, Vice President, Finance. Please go ahead.
Thank you. Good afternoon, everyone. Today's agenda will include a review of our results for the fourth quarter of fiscal 2025 with Samuel Wilson, our Chief Executive Officer, and Kevin Kraus, our Chief Financial Officer. Following our prepared remarks, there will be a question-and-answer session. Before we get started, let me remind you that our discussion today includes forward-looking statements about our future financial performance, including investments in innovation and our focus on profitability and cash flow, as well as statements regarding our business, products, and growth strategies. We caution you not to put undue reliance on these forward-looking statements, as they involve risks and uncertainties that may cause actual results to vary materially from forward-looking statements, as described in our risk factors in our report filed with the SEC.
Any forward-looking statements made on this call and in the presentation slides reflect our analysis as of today, and we have no plans or obligations to update them. All financial metrics that will be discussed on this call are non-GAAP unless otherwise noted. These non-GAAP metrics, together with year-over-year comparisons in some cases, were not prepared in accordance with U.S. generally accepted accounting principles, or GAAP. A reconciliation of these non-GAAP metrics to the closest comparable GAAP metric is provided in our earnings release and our earnings presentation slides, which are available on 8x8's Investor Relations website at investors.8x8.com. With that, I'll turn the call over to Samuel Wilson.
Good afternoon, everyone. Thank you for joining us today to review our fourth quarter and full fiscal year 2025 performance. I want to express my deep appreciation to our global team, our customers, our partners, and our investors. This quarter reflects the grit, focus, and long-term thinking that defines 8x8 and gives me real confidence about where we're headed. Before we get into the details of the quarter, I want to address a few of the broader market dynamics. While our opportunity remains large, the economic picture has shifted, and recent tariff actions and global uncertainty have added more noise to an already complex environment. We're staying focused on what we can control: disciplined execution, platform innovation, and delivering outcomes that matter to our customers.
Markets will ebb and flow, but what doesn't change is our commitment to building a durable, cash-generative business that creates long-term value, and that's exactly what we're doing. We're not dismissing these challenges, but we've prepared for them. Our business model is built on resilience, and the results for the quarter reflect operational discipline, business quality, and the flexibility to keep investing where it counts. Our theme for today is simple: the flywheel is starting to turn. After several years of foundational work, we are seeing real acceleration in our core 8x8 revenue, platform differentiation, and strategic execution. This momentum is visible in our numbers, in our innovation, and in the way our customers are responding. Let's walk through three key messages we believe define the fiscal fourth quarter and FY25, and why I'm confident we have a solid future.
As many of you know, we began a massive transformation of 8x8 in earnest in fiscal 2023 on the heels of our acquisition of Fuze. We had a clear plan: fix our financial model, invest in innovation and retention, and deliver measurable CX outcomes for our customers. We took bold steps to set the stage. We began paying down debt to increase our financial flexibility. We rebranded the company and completely rebuilt our go-to-market functions while continuing to invest in innovation. Now, as we exit fiscal 2025, I am confident in saying we are starting to see the results of our GTM rebuild, which is not complete yet. For the fourth quarter, year-to-year growth in 8x8, excluding revenue from all Fuze customers, accelerated to 4.6% from 2.7% in Q3.
This is the second consecutive quarter of improvement and marks our highest growth rate in 8x8 standalone service revenue in 10 quarters. We've also accelerated when looking at the entire fiscal year. For fiscal 2025, 8x8 service revenue, again excluding revenue from Fuze customers, grew 2.8% compared to growth of 1.8% in fiscal 2024. Lastly, as Kevin will discuss, the combined cash flow from operations for fiscal 2024 and 2025 is the highest two years ever at 8x8, and over half our market capitalization as of Friday. We have used the cash wisely, paying off debt and reinvesting in platform innovation that is driving today's growth. Highlights for the fourth quarter include continued rapid adoption of our Communications APIs, also known as CPaaS. The number of interactions surged in the fourth quarter, driving solid growth.
The number of customers with three or more products increased 13% year-over-year to more than 700 customers. This reflects increasing cross-sell to our installed base, as well as landing more new logos with multiple products. Demonstrating this trend, 80% of our top 20 new logo customers and two-thirds of our top 20 add-on deals included both unified communications and contact center. We saw strong momentum in sales of our Microsoft Teams integrations, with new license sales up 72% in the fourth quarter of 2024. The cumulative number of licenses sold into Teams environments grew 30% year-over-year and now totals more than 550,000 seats. We also continue to see sizable use-only deals as customers migrate from legacy vendors, in particular Avaya, Mitel, and Cisco. We win these deals based on the strength of our unified platform, and the initial UCaaS deployment is typically the first phase of a multi-product adoption.