Two well-publicised vendor changes are coming in the second half of 2026 — one from Google's Chromium project, the other from Microsoft. Both have been on the roadmap for some time, both are being handled well in advance by MYOB, and both will be a non-event for Avanza Solutions customers we're already engaged with on upgrade planning.
If you've seen the headlines and wondered what they mean for your MYOB Acumatica environment, this article is for you.
The bigger picture: two long-planned modernisation moves
It's worth understanding what's actually driving these changes, because the framing matters. Neither is a surprise, and neither is being done in a rush.
Chromium is removing a legacy technology called XSLT
XSLT (Extensible Stylesheet Language Transformations) is a way of transforming XML data into HTML so a browser can display it. It was recommended by the World Wide Web Consortium back in November 1999 and shipped in browsers shortly after — so it's about 26 years old.
The technology hasn't aged well. Browser support stagnated at the original 1999 version, modern web frameworks long ago moved on to JavaScript and JSON, and today fewer than 0.02% of web pages use XSLT at all. More importantly, the underlying libraries that process XSLT in browsers are complex, ageing C/C++ codebases that have been the source of recent high-profile security vulnerabilities. Google's security team has decided the modern security risk outweighs the small remaining utility.
This isn't a Chrome-only decision: Mozilla's Firefox engine and Apple's WebKit (which powers Safari) have both also indicated they will remove XSLT. It's an industry-wide modernisation.
The Chromium team has set out a staged timeline: early warnings began in Chrome 142 (October 2025), Enterprise Policy controls go live in March 2026, an Origin Trial opens in August 2026, and XSLT stops functioning in Stable Chrome on 17 November 2026. An extended Origin Trial and Enterprise Policy pathway runs until 17 August 2027 for organisations that need more time.
Microsoft is retiring Exchange Web Services in favour of Microsoft Graph
Exchange Web Services (EWS) is the API that has connected third-party applications to Exchange and Microsoft 365 mailboxes for nearly twenty years. Microsoft announced back in 2018 that EWS would no longer receive new features, and confirmed in 2023 that it would be disabled in Exchange Online in October 2026.
The replacement is Microsoft Graph, Microsoft's modern, unified API across Microsoft 365. Graph offers better security, modern authentication, more granular permissions, and access to capabilities EWS was never designed for. It's the API every Microsoft 365 integration is moving to.
Microsoft has been clear about why: EWS "was built nearly 20 years ago, and while it served the ecosystem well, it no longer aligns with today's security, scale, or reliability requirements." The Midnight Blizzard security incident in early 2024 — which involved EWS — accelerated the timeline.
The phased disablement plays out across 2026 and 2027: F1, F3 and Kiosk licences were blocked on 1 March 2026, EWS is disabled by default for tenants starting 1 October 2026, and final shutdown occurs in April 2027.
What this means for MYOB Acumatica
Both changes touch features used by MYOB Acumatica:
- Chromium XSLT affects the Acumatica Classic UI in Chrome and Edge. The Modern UI is unaffected.
- Microsoft Exchange EWS affects Acumatica's Exchange Integration and Scheduled Processing features for customers using Microsoft 365 / Exchange Online.
The good news is that MYOB has known about both deprecations well in advance and has already engineered the fixes. They're being delivered in a single upgrade path:
| Change | Effective date | Vendor extension available until | Resolved in |
|---|---|---|---|
| Microsoft Exchange EWS retirement | 1 October 2026 | 1 April 2027 | MYOB Acumatica 2025.2.2 or higher |
| Chromium XSLT removal | 17 November 2026 | 17 August 2027 | MYOB Acumatica 2025.2.3 or higher |
A single upgrade to MYOB Acumatica 2025.2.3 — releasing in June 2026 — covers both changes in one go. That gives more than three months of comfortable runway before the earlier of the two deadlines.
Our approach: planned, paced, and proactive
This is the part we want our customers to take away. These changes are being handled, not reacted to.
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MYOB has built the fix. The required Acumatica version (2025.2.3) is on track for a June 2026 release, well ahead of both vendor deadlines.
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We're contacting customers directly. Avanza Solutions consultants are reaching out to every affected customer to walk through what these changes mean for their specific environment and to plan upgrade timing together. If you're an existing customer, your consultant will be (or already has been) in touch.
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One upgrade, both issues resolved. Rather than separate projects for each deprecation, customers move to 2025.2.3 once and both are taken care of.
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Plenty of time, deliberately used. We're booking upgrades from now through the middle of 2026 so customers can choose timing that suits their business cycle, rather than competing for slots in a last-minute rush.
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Vendor extension pathways exist as a fallback. Both Google and Microsoft have provided extension mechanisms that run into 2027 for organisations that genuinely cannot upgrade in time. We don't expect to need them — but they're there.
There's no fire to put out here. These are routine upgrade conversations on a comfortable timeline, driven by sensible long-term decisions from Google and Microsoft to modernise the underlying technology stack.
A note on Exchange Integration
If you use MYOB Acumatica's Exchange Integration or Scheduled Processing features against a Microsoft 365 mailbox, the Exchange change is the one to focus on first, since it lands earlier (1 October 2026) and the minimum supported Acumatica version is slightly higher.
If you're not sure whether you use these features, that's exactly the kind of question your Avanza Solutions consultant will work through with you. It's a quick check.
Frequently asked questions
Will my MYOB Acumatica stop working overnight? No. Vendor extension mechanisms remain available into 2027, and we're planning all customer upgrades well ahead of either deadline. If a customer can't meet the earlier dates, there are documented pathways from both Microsoft and Google to keep services running until 2027.
Does this affect customers on Modern UI? The Chromium XSLT change does not affect the Modern UI. The Exchange change is independent of UI choice — it affects Exchange Integration and Scheduled Processing regardless.
What if I'm using Exchange on-premises rather than Exchange Online? The Microsoft Exchange change applies only to Exchange Online (Microsoft 365). On-premises Exchange Server is unaffected by this announcement.
Do I need to do anything today? If you're an Avanza Solutions customer, your consultant will be in touch (or already has been) to plan timing. There's nothing for you to action independently.
I'm not currently an Avanza Solutions customer — should I be worried? If you're running MYOB Acumatica with another partner, they'll be planning their own approach. If you'd like a second opinion or you don't currently have a partner actively engaged on upgrades, get in touch with our team and we'll happily talk it through.
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