Outlook Data File – The file C:\Users\<username>\AppData\Local\Microsoft\<username>\username.ost is in use and cannot be accessed. Close any application that is using this file, and then try again.

If you see This is not a valid file name error in Outlook when sending an email, then try these working solutions to fix the issue successfully.

What data file types does Outlook support? While working with Outlook, you will encounter two data file types: OST and PST. OST (Offline Storage Table) file types allow you to work offline.

Microsoft Outlook is a robust email client for managing emails, calendars, contacts, and tasks. However, Outlook users occasionally encounter a common and potentially disruptive issue: corruption in ...

If you are someone who has encountered the frustrating experience of lost mailbox data due to PST file corruption, you know how inconvenient and ...

An Outlook Data File (.pst) file is a copy of the information in your Outlook account (including, but not limited to, emails, contacts, and appointments) stored on your local device.

When I did a fresh install of XP, I installed Outlook, and then imported a .pst file from my old computer. I had copied the file, labled backup.pst, into my "my documents" folder, and then ...

It will default to \Documents\Outlook Files\archive.pst, but you can either change it manually or click on Browse… to find a new file location. When you’ve made your choices, click OK.

Microsoft Monday said it will provide patent- and license-free use rights to the format behind its Outlook Personal Folders (known as PST files), opening e-mail, calendar, contacts, and other ...