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Is there a limit on how large a user's Outlook 2016 .OST file can get?<br />
<br />
An Office 365 user who has full delegation to 7 other user's mailboxes within Outlook reports that he been receiving error messages regarding having too large of Outlook space utilization.<br />
<br />
He hasn't been able to take any screenshots and I haven't seen this error message yet.<br />
<br />
I checked and the user's mailbox as well as all of the additional 7 other mailboxes are well below the 50 GB Office 365 storage capacity limit.<br />
<br />
The user's operating system is Windows 7 64-bit. All of the latest Windows and Office updates have been installed.<br />
<br />
So can this error message be attributed to the user's .OST file size being too big or what else might be causing this error message?
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Is there a limit on how large a user's Outlook 2016 .OST file can get?

An Office 365 user who has full delegation to 7 other user's mailboxes within Outlook reports that he been receiving error messages regarding having too large of Outlook space utilization.

He hasn't been able to take any screenshots and I haven't seen this error message yet.

I checked and the user's mailbox as well as all of the additional 7 other mailboxes are well below the 50 GB Office 365 storage capacity limit.

The user's operating system is Windows 7 64-bit. All of the latest Windows and Office updates have been installed.

So can this error message be attributed to the user's .OST file size being too big or what else might be causing this error message?

Errors regarding having too large of Outlook space utilization/Outlook 2016 .OST file size limit

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.

Windows 7

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.