When you launch the Outlook and receive an error mentions "Cannot expand the folder.The set of folders cannot be opened.", it may result from many factors such as bad sectors,PST corruptions and so on. We will explore the solutions to this annoying problem.

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*Various Outlook errors have different
corresponding causes.
*When users encounter problems, finding
the behind reason and solving the issue
easily is the ultimate aim.
*And today, we will offer a quick guide to a
typical Outlook error which is shown as
below.

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*There is no doubt that if your data file is
located on a bad sector, this error will occur
with big probability.
*So we can use CHKDSK which is offered by
system to confirm the question.
1. To begin with, quit Outlook and go to “Start
Menu”. Type “cmd” in the search field.
2. Then a program will show up, and right click
it to select “Run as administrator”.

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3. Next in Command Prompt, input
“chkdsk diskname: /f” and click the
“Enter” keyboard button.

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4. Later, if you let it to check the system disk
where Windows is installed, it will ask whether
to schedule a disk check next time system
restarts. If you just want to check other data
drives, it will work right now.
5. In the end, after the fix process, restart Outlook
to see if the issue is gone or not.

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*Besides, if users want to access a data file
located on a network share which
Outlook doesn’t allow, then such error
will pop up soon.
*Just keep in mind that always save the
data file to local before connecting to
Outlook.

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*If above approaches are not helpful, the
most possible situation is that your PST
file is compromised.
*In case of even more disastrous data loss,
you should make use of repair tools to
assist you.
*The inner program called ScanPST could
be the logical choice.

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① Search “scanpst” in explorer to find the tool.
② Start the tool, and click “Browse” to select the
source file.
③ Then click the “Start” button to check and
repair the data file.

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*As the inbuilt repair tool is not strong
enough and tends to make things worse,
it’s highly suggested to single out an
eminent tool like DataNumen Outlook
Repair to help with the tough issues.
*A professional and reliable tool is the
cornerstone of the success.

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