Today it becomes quite easy to convert all data of Microsoft exchange OST file into Outlook PST file. In many situations it becomes a necessity to convert OST to PST. Like when you have a backup of OST file but no longer access with Exchange server. In this case you have a solution to access OST data by converting your OST file to PST file. A lot of software are able to convert unusable OST to usable PST. However, you have an option to choose a third party OST to PST conversion tool that easily converts OST file to PST file and enables you to manage messages, contacts, notes, meetings, reminders, tasks and appointments with much ease.

Let's consider an example. For say, when you try to start Microsoft Outlook and try to synchronize the offline work done with MS Exchange Server, you get the following error message that prompts on your screen.
“Cannot open your default email folders. The file *.ost is not an offline folder file

On encountering above error message you become unable to synchronize the OST file with Exchange server.

Reasons for Occurrence of this Error:

There can be quite a lot of reasons for which MS Outlook reports this error . The root cause of the error can be issues with synchronization of Microsoft Exchange OST with exchange server are as follows:

Corruption of OST file due to virus infection, malicious software, and operating system failure and MS-Outlook is unable to recognize this file. OST file related with the particular Exchange Server mailbox cannot be recognized with MS Outlook. The error occurs generally while synchronization. When your account has been deleted from the Exchange server. If there is a problem in a server or server is not available Any kind of change in the OST file make it unavailable for use.
Solution for the error:

Plenty of software have been introduced to resolve this error. You can use a third party OST to PST software that convert OST to PSTand restores (will not recover lost data of your mail box only restore it) mail-objects such as e-mails, contacts, journals, appointments, scheduled- meetings etc. Built with graphical user-interface, these tools are easy to understand without any prior technical skills.

Stellar Phoenix Mailbox Exchange Desktop v4.0 ensures quick and safe conversion of OST files to PST files without changing the original file structure. This software restores mail objects, such as mails, calendar-entries, notes, contacts and journals and many more objects. This tool supports Microsoft Outlook 2007, 2003, 2002 and 2000.