Fix OST file Maxed out error in Outlook in simple steps | Office 365 |2020

Both OST and PST files hold importance to an Outlook user. Corruption in any of these will ultimately cause Outlook to suffer. OST file is a backup copy of data available in Exchange Server configured with Outlook with some predefined size limitations. The storage capacity of the file depends on the installed version of MS Outlook application. How OST files get oversized? OST file contains all the data you have generated or received since the account is activated on Outlook. It includes all emails (different folders), attachments, calendar schedules, tasks, contacts, notes, hidden items, public folders, etc. When you forget to delete unimportant data, it gets piled up, exceeds the file storage limit and causes corruption in OST file and troubles in Outlook. Large-sized attachments are special to mention for oversized OST file.