How to troubleshoot 'outlook disconnect automatically' issue

Option 1

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1. Click Start -> Control Panel -> Mail.

2. Click E-mail Accounts.

2. In the E-mail Accounts dialog box, click ‘View or change existing e-mail accounts’ and then click Next.

3. Double-click your Exchange Server account, and then click ‘More Settings’.

4. On the General tab, in the When starting box, please make sure that "Automatically detect connection state" is selected.

Option 2 :

1. Close outlook
2. Search for the following four files and rename them by changing the file extension from ".dat" to ".old"
   : outcmd.dat, extend.dat, frmcache.dat, views.dat.

Note: These files are normally located under ‘C:\Documents and Settings\<username>\Application Data\Microsoft\Outlook’ folder.
             In some condition you may not see any file other than Outcmd.dat.

Option 3 : Create a new outlook profile and check the status.