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Outlook is an important Microsoft application that consist several outlook objects like email messages, journal, notes, tasks, appointments and several others. These objects stores in single PST file. Outlook PST files often get corrupted due to several reasons like virus infection, storing PST file on network, software errors, improper system shutdown and other reasons. Sometimes PST files become inaccessible due to corruption in these files. In these situations you may run inbox repair tool or scanpst.exe tool to repair corrupted PST file. But outlook may display below mentioned messages while you attempt to run inbox repair tool.
"Attempting to validate BBT Refcounts"
OR,
"Couldn't find BBT entry in the RBT (211C8)"
It is important to fix attempting to validate BBT Refcounts error as early as possible to avoid any further damages. Inbox repair tool is a universal solution to correct PST file errors. But it has some limitations and it cannot work in all situations. Some common reasons behind these errors are large size PST files, Corruption in outlook PST file, invalid BBT entry of PST file. If you are using outlook 2002 and earlier version then your PST file size should not be more than 2 GB in size. However, PST file size in Outlook 2003 and above version supports PST file size up to 20GB by default. You may receive outlook errors when PST file size increased beyond its limit.
You may fix attempting to validate BBT Refcounts or similar errors by following the steps mentioned below. It is strongly recommended to keep full system backup before moving towards removal steps. You may need to restore outlook data after completing repair process.
Reduce PST file size if file size is greater than outlook size limits. You may do so by removing unwanted items from inbox, sent items and emptying deleted item folders.
If problem is due to invalid BBT entry then correct it by reinstalling outlook
If PST file is corrupted and scanpst.exe is unable to fix it then use professional PST repair tool to fix attempting to validate BBT Refcounts error.
Professional PST repair tool is packed with advance programming codes that can repair and recover PST data without any change in original content. It is easy to install and use. Solve PST related errors by using this tool in easy and safe steps.

Download Free PST Repair Tool