If the goal is to convert OLM files into a usable format, you can do it without opening the original mailbox in Outlook for Mac. A dedicated OLM converter can read the file and export emails with attachments to formats such as EML, EMLX, MSG, PDF or MBOX.

Simple Conversion Steps

Open the OLM Converter and browse the required OLM file. Preview the mailboxes, folders, attachments, contacts,
calendars or other available data. Select the required items or choose the complete mailbox. Pick the desired output format and destination. Start the export and verify the converted files.

I’ve found TrustVare OLM Converter useful when selective conversion, orphan OLM files or preservation of folder hierarchy and email metadata is important. Its demo version lets you convert 10 items from each folder before purchasing.

If you need the exact method for OLM to EML, EMLX, MSG, MBOX, or PDF, I can explain that specific conversion.

The best technique to export emails from Office 365 to a Thunderbird Profile is to first create a backup of Office 365 email in MBOX format and then import the MBOX file into a Thunderbird Profile. For creating an Office 365 email backup, you can use reputable tools like Softaken Office Backup Tool. With the use of this software, you can smoothly create a backup of your Office account in MBOX format and then easily import the MBOX files into Thunderbird using the Import/Export NG Tool.

To convert multiple EML files into a single PST, the easiest approach is to add the EML files or their containing folder to an EML-to-PST converter and export them together as one Outlook PST file.

I had to do this when I had a large collection of EML emails that needed to be opened together in Outlook. Importing or dragging the messages individually was taking too much time, so I used WholeClear EML to PST Converter instead. I could add the EML folder in bulk, preview the emails, and export them into PST while keeping the email details, attachments, and folder structure.

This also makes more sense when there are hundreds or thousands of EML files. After conversion, I’d open the single PST in Outlook and check a few folders, messages, and attachments before removing the original EML files.

The tool also works without requiring Outlook or another EML application to be installed, according to its current product documentation.

For this particular requirement, I’d suggest trying BitRecover MSG Duplicate Remover. It is specifically made to locate and remove duplicate MSG items in bulk, so you don’t have to check the files manually one by one. You can add individual MSG files or complete folders and use filtering options to identify duplicates based on the available email details.
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EML and MBOX are different mailbox formats, so conversion is needed when emails are stored individually. EML files have to be brought together into an MBOX based mail archive. The process is fairly simple if the files are already saved on a Windows computer.

A practical option is to use GainTools EML to MBOX Converter. It allows EML messages to be added separately or from a folder, provides a preview before export and creates the MBOX file at a location selected on the computer. It also supports EML files originating from Thunderbird, Apple Mail, Windows Live Mail and other email clients.

After the export, open the MBOX in the intended mail application and check a few messages. That quick check is worthwhile before putting the original EML collection aside.

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