Calibre 2.49 发布，此版本更新内容如下：
- E-book viewer: Add an option to allow only a single book to be viewed at a time. Trying to view a second book will cause it to replace the currently viewed book.
Closes tickets: 1526504
- Kobo driver: Add support for the new firmware 3.19.5761
- Linux build: Update bundled version of Qt to 5.5.1
- Fix splash screen getting stuck on OSX when restarting calibre in debug mode
- Get Books: Update plugins for various Polish language book stores to handle changes to the website
- Amazon metadata download: Handle a change in the amazon website that prevented review metadata from being downloaded
- Better algorithm for guessing the ‘external’ network interface that is displayed to the user
- Tag Mapper: Do not allow the user to create rules with invalid regular expressions
- E-book viewer: Disallow hyphenation in documents that use mathematical typesetting as the hyphenation breaks that typesetting
- E-book viewer: Fix some non-ASCII characters not display in embedded MathML.
Closes tickets: 1532323
- Download calibre plugins securely using HTTPS
- MOBI Output: Try to autofix corrupted PNG images in the input document.
- Nook Glowlight Plus: Send files by default to the NOOK/My Files folder.
- E-book viewer: Fix failure to view comic files that contain non-ASCII characters int heir internal filenames.
Closes tickets: 1530517
- LaRed21 by Carlos Alves
- Echo Online
- Various Uruguayan news sources
- Economic and Political Weekly
Calibre是电子书管理软件，支持Amazon、Apple、Bookeen、Ectaco、Endless Ideas、Google/HTC、Hanlin Song设备及格式，功能十分强大。