This conversion seems to be mostly related to the transfer of e-mail data from one computer to another, especially if each machine is using different program for e-mail management. You can find various 3rd party tools designed to help you with the transfer process.
Home > Search converters: mbox to olm
Conversion of mbox file format to olm file format beta
Search for mbox to olm converter or software able to handle these file types.
Convert Mail mailbox to Outlook for Mac e-mail database.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software 
- convert mbox to olm on OS X
Microsoft Outlook for Mac
Mac version of the popular e-mail client and personal information manager from Microsoft
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from mbox file | No | No | No | No | No | Yes | No | No |
to olm file | No | Yes | Yes | olm editor | Yes | No | No | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open mbox file, Open olm file
MBOX
Files with mbox file extension can be found as saved email mailboxes, mainly from programs on Linux or Unix platform as well as OS X (macOS).
OLM
Files with olm file extension can be quite often found as email client databases from Microsoft Outlook for Mac. Similar to PST format in purpose
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