Knowing these can help you and your doctor identify the cause of your lightheadedness and the best way to rid yourself of it. 1  If you are over the age of 65 years, you are more likely to have a medical condition or take medications that causes lightheadedness.n fact, you can usually figure out the cause of lightheadedness based on the sensations you are feeling. Knowing the cause will also give you a clue of how best to get rid of your lightheadedness.
Difference between MS Outlook OST & PST files. OST stands for Offline Storage Tables. It is an offline folder created by MS Outlook and MS Exchange to hold offline copies of whatever exists in the Exchange server. To make it more simple to understand, you can just call OST files as as local copy of your Exchange mailbox. It is created when your emails are delivered to your Outlook mailbox and will contain all your emails, contacts, calender entries and tasks. Outlook has to be in Cached mode for Offline folders to work.
When using Microsoft Outlook to open or synchronize an offline folder (.ost) file, you see the following error message: Unable to expand the folder. The set of folders could not be opened. Errors could have been detected in the file xxxx.ost.Quit all mail-enabled applications, and then use the Inbox Repair Tool.lose Microsoft Outlook and any other applications that may access the OST file. Find the OST file that causes the error. Based on the information in the error message, you can easily find that file. You can also use the Search function in Windows to search for the OST file. Recover the offline data in the OST file.