And OST & PST are the file formats used by Microsoft Outlook to save all your data mentioned above. OST is your offline folder in MS Outlook. These files make possible for Outlook to be used even in offline mode and to sync automatically when connected to the internet. It is used in Exchange environment by using MS Exchange server.How to compress Ost file in outlook?
Outlook has an option to compact .OST and .PST files, which compresses the OST or PST file and reduces the file size. The steps are as follows, Click Settings> Advanced > Outlook Data File Settings… This will compress the OST file to an extent and may resolve the issue temporarily.How do I open an OST file?
#1 - As you've discovered, an OST file can only be opened/read by the original Outlook profile/email account used to create the file. Every time an IMAP or Exchange account gets configured, a new OST file is created #2 - For a COX account, this would be for an IMAP account.What does Ost file has reached the maximum size mean?
Summary: OST file has reached the maximum size is an error message that appears when the size of OST reaches its configured file size or threshold limit. In this guide, we have shared a few fixes and solutions that can help you resolve the OST file size issue in Windows Outlook.