When migrating your email from Hostinger to Office 365, a critical decision is choosing between IMAP and POP3 protocols. Each method has its advantages and disadvantages.

IMAP is generally recommended for most users. It synchronizes your email between your Hostinger account and Office 365, allowing you to access your messages from either location. Changes made in one place are reflected in the other. However, IMAP requires a consistent internet connection to maintain synchronization.

POP3 downloads a copy of your emails to your Office 365 account and deletes them from the Hostinger server. While this might seem efficient, it can lead to data loss if you accidentally delete emails on your Office 365 account. Additionally, you won't be able to access your emails from multiple devices simultaneously.

For most users, IMAP is the preferred method due to its ability to maintain email consistency across different platforms. However, if you have limited internet access or want to completely disconnect from Hostinger, POP3 might be a viable option.

Ultimately, the best choice depends on your specific needs and preferences. Consider factors like internet connectivity, email management habits, and the importance of preserving email history when making your decision.