What is OTM File Extension?
An OTM file stores macro written for MS Outlook. The entire Macros of Outlook is retained in a single VbaProject.otm file. It holds scripted apps developed in the Visual Basic Editor. These programs are used to scan email messages and collecting attachments.
It falls in the category of Project Files.
MS Office Outlook
The developer of OTM is Microsoft.
The location of the file format is depended on the operating system and Outlook version using by users.
Outlook 2007 on Windows Vista/Windows 7
Outlook 2013 on Windows 8
How to open or view OTM File Extension
To View the OTM files, all you need to use MS Outlook.