Hi!

Given: Quote has a lookup with Pricebook.
I want to write a validation rule on Quote object, to not change the pricebook if Quote line items already exists. 
 

Mozilla Thunderbird email client stores emails in an MBOX file but Microsoft Outlook doesn't support Mbox file. To import emails from Mbox file into Outlook you need to convert Mbox file into PST format. 

To convert MBOX to PST (https://www.vsoftware.org/mbox-converter.html) file vMail MBOX Converter is one of the easy to use and effective tool. This tool is capable to recover all emails from Mbox file with all emails properties like To, CC, BCC, Date-Time, Subject & Attached Files. (You can preview all recovered email data in the software before starting conversion). After that, you can easily export all emails to Outlook PST file and other formats like MSG, EML, EMLX & HTML. Email migration option to Office 365 is also available in this MBOX Converter. To access all emails you just need to import the PST file using Import/Export wizard in Outlook.

Learn More- https://www.vsoftware.org/blog/export-thunderbird-emails-to-outlook.html