CiraSync launches buy-vs-build guide for Microsoft 365 contact sync

CiraSync released a new resource to help IT leaders and MSPs decide whether to build Microsoft 365 contact and calendar sync tools in-house or buy a platform. The guide lands as Microsoft starts phasing out Exchange Web Services on Oct. 1, 2026, a change that could break older home-grown scripts.

Why it matters: - Microsoft’s retirement of Exchange Web Services raises the risk for organizations still depending on home-grown contact and calendar sync scripts. - IT teams now have to weigh up-front build costs against ongoing maintenance, reliability and security obligations. - The decision affects Microsoft 365 environments that need contacts and calendars kept current across users and devices.

What happened: - CiraSync released a new Buy vs. Build resource for IT leaders and MSPs. - The guide is designed to help teams choose between building a Microsoft 365 contact and calendar sync tool in-house or adopting a purpose-built platform. - Microsoft is beginning to retire Exchange Web Services in stages starting Oct. 1, 2026. - The change will directly affect many home-grown scripts that still rely on EWS.

The details: - The guide compares five decision factors: build cost, ongoing maintenance, customizability, reliability at scale, and security and compliance. - CiraSync says maintaining a home-grown script can take 130 to 260 hours a year in support tickets alone. - That estimate does not include monitoring, duplicate cleanup or API updates needed to keep pace with Microsoft changes. - The resource draws on CiraSync’s companion blog post, “Build vs. Buy: You Can Build This. The Question Is Whether You Want to Own It.” - The blog says earlier platform shifts, including the 2022 retirement of Basic Authentication, have broken home-grown integrations without warning. - The guide includes side-by-side comparisons of initial setup, platform maintenance, and monitoring and recovery between an in-house build and CiraSync. - The resource also includes customer accounts from teams that built their own solution before switching. - The guide is available in CiraSync’s Resource Library alongside case studies, eBooks and product guides. - Full analysis is available on CiraSync’s blog at the company’s blog article.

Between the lines: - The release is a clear push to frame “simple” internal scripting as a long-term ownership decision rather than a one-time project. - Microsoft’s API and authentication changes have become a recurring operational risk for teams that build on top of its services. - CiraSync is positioning its platform as the lower-maintenance option for organizations that want to avoid recurring IT overhead.

What's next: - IT teams reviewing Microsoft 365 sync options will likely need to reassess any scripts tied to EWS before the retirement timeline advances. - Organizations comparing build and buy options can use the new resource to benchmark support burden, recovery work and security exposure. - CiraSync is continuing to add AI-powered capabilities and integrations to its broader people data management platform.

The bottom line: - The resource turns a technical migration issue into a business decision about cost, risk and long-term ownership.