New Outlook is here: what it means for your project email

New Outlook is Microsoft's rebuilt email client, and Microsoft is moving all users toward it. For AEC firms the risk is that the switch breaks email filing, scattering project correspondence you later need in disputes or after staff leave. Ideagen Mail Manager supports New Outlook now through the Mail Manager Desktop NOW Bridge, across SharePoint, file servers and ProjectWise.

Microsoft is steering every user toward New Outlook. Classic Outlook for Windows is no longer receiving active feature development, and organizations are rolling out New Outlook as part of standard Microsoft 365 updates. For most people the change looks cosmetic. For project teams it is not.

Why does New Outlook matter for project email?

Your inbox is not just messages. It is the record of what was agreed, approved and instructed across every project you run. Ideagen's 2022 State of AEC Project Management research, a survey of 507 AEC leaders, found that 47% of project information relating to scope changes sits in email. Ideagen's 2024 State of Tech Adoption in AEC report, a survey of 188 AEC IT decision-makers, found 62% say documents and emails are often filed incorrectly. So the record that matters most is also the one most likely to be misfiled, and a client migration only raises that risk.

When the email client changes, the filing tools and habits that keep that record organized can break, often without anyone noticing. If filing stops, correspondence drifts back into individual inboxes and the project record fragments. Two consequences follow, and both cost firms real money.

The dispute you cannot defend

In construction and engineering, email is not just communication. It is evidence. When a client challenges a scope change or an approval, you need the email. Complete, and fast. The Arcadis 2025 Global Construction Disputes Report puts the average North American dispute at $60.1 million and 12.5 months to resolve. Searching scattered inboxes by hand wastes days at exactly the wrong moment. As Paul Hill at Arup puts it, "Most projects don't go wrong, but if they do, email becomes critical."

The knowledge that walks out the door

Project teams disband. People move on. When someone's inbox goes with them, years of client correspondence and project decisions go too. Ideagen Mail Manager files email to the project rather than the person, so that knowledge stays in the business. When someone leaves, the knowledge stays. Kasa Companies kept its records centralized for exactly this reason, so departing staff no longer take project history with them.

Does Mail Manager support New Outlook?

Yes. Ideagen Mail Manager Enterprise fully supports New Outlook, and Ideagen Mail Manager supports it now through the Mail Manager Desktop NOW Bridge. The NOW Bridge preserves the filing prompt teams already use, so the workflow does not change when the client does. This matters because the alternative is silent filing failure, where the switch quietly stops email being filed until a dispute or audit exposes the gap.

Claims from newer alternatives that Mail Manager will never support New Outlook are not correct. Mail Manager files email as you send and receive it, suggests the right project location and makes any email findable in seconds however old it is. It files into your own infrastructure, so your data stays yours. Built at Arup in 2003 and now used by 48,000+ professionals across 2,600+ firms, Mail Manager has already carried customers through multiple Outlook versions and Microsoft 365 transitions. Formation Architects cut the time to find a specific email from up to a week to seconds.

Frequently asked questions

Does Ideagen Mail Manager work with New Outlook?

Yes. Ideagen Mail Manager Enterprise fully supports New Outlook, and Ideagen Mail Manager supports it through the Mail Manager Desktop NOW Bridge, across both Microsoft 365 and non-Microsoft 365 backends.

Will I lose my filing when I move to New Outlook?

Not if filing is automated and your tool supports New Outlook. Mail Manager suggests the right project location for each email regardless of which Outlook you use, so correspondence stays filed through the switch.

Is New Outlook replacing classic Outlook?

Microsoft has stopped active development on classic Outlook and is directing all investment to New Outlook. Classic Outlook still works today, but New Outlook is positioned as the future client.

Why does email matter so much in AEC projects?

Ideagen's 2022 research of 507 AEC leaders found 47% of scope-change information sits in email. When a dispute arises, that correspondence becomes the evidence you rely on.