Thank you for your questions about Amazon WorkMail. I'll address each of your concerns: 1. Importing contacts from a .vcf file: Unfortunately, Amazon WorkMail does not have a direct method for importing contacts from a .vcf file through its web interface. WorkMail is designed to work seamlessly with existing email clients, so you may want to try importing your contacts through a supported email client like Microsoft Outlook, which can then sync with your WorkMail account. 2. Thunderbird and Calendar functionality: While Thunderbird works well for email with Amazon WorkMail, calendar functionality is not natively supported. Amazon WorkMail is designed to work best with Microsoft Outlook, native iOS and Android email applications, and its own web client for full email, calendar, and contact synchronization. For full calendar functionality, you may need to use one of these supported clients or the Amazon WorkMail web interface. 3. Spam Filter information: Amazon WorkMail includes built-in spam and virus protection, but detailed information about the specific spam filter used is not publicly available. The service automatically scans incoming and outgoing emails for spam and malware. If you need more control over spam filtering, you might want to explore using Amazon WorkMail in conjunction with Amazon Simple Email Service (SES), which offers more customizable content filtering options. For the best experience with Amazon WorkMail, including full access to email, calendar, and contacts, it's recommended to use the Amazon WorkMail web client or one of the fully supported email clients like Microsoft Outlook or native mobile apps on iOS and Android. **Sources** Setting up email clients for Amazon WorkMail - Amazon WorkMail Getting started with Amazon WorkMail - Amazon WorkMail Amazon WorkMail FAQs – Amazon Web Services What is Amazon WorkMail? - Amazon WorkMail