I cannot start Outlook. This message comes up everytime I try: cannot start Microsoft Office Outlook. Unable to open the outlook window. The set of folders could not be opened. the server is unavailable

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This error occurs when there is any firewall or windows defender is activated in your device. You need to disable it and then try to start your Outlook and this problem will no more exists.

If still problem persists then get connect at Outlook Mail Support Number 1-800-243-0019 and get in touch with Outlook tech team experts for resolving errors in your account.

Hi Roy,
There are two different solutions which can be applied to resolve this error.
1) Uncheck the checkbox "run this program in compatibility mode" in properties of Outlook.
2) Or you can resetnavpane of outlook.exe
If you want to know the detailed process to resolve this error then go to this link: Can start Microsoft Outlook Can not open Outlook 2013

There are 2 reasons Y Outlook would not open, If the Outlook profile is corrupted or the Outlook data file which contains e-mails, contacts are corrupted. Create New profile in Outlook : Got to start -> Control Panel -> Mail -> Show Profiles -> Ad new profile and setup your e-mail account if you know the settings if not call your Internet service provider and setup the account, once done select " Prompt for a profile to be used" so that when opening Outlook, it will give you option to select the new profile. Once you open Outlook in new profile -> Go to File -Open -> Outlook Data file -> Select "Outlook" file and click open, you will find another set of personal folder in outlook right hand side. If you are able to access it then go to Tools -> account settings -> Data file and make the Outlook file as default from "Outlook1" file. If you find it difficult please let me know, cause it is simple but may find confused o complicated.

If you have any firewall or antivirus software means please go ahead and disable it and try to access the microsoft outlook it might works