Windows Phone 8.1 mainstream support ends 11 July 2017

Microsoft Support LifeCycle

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Microsoft Support Lifecycle policy provides consistent and predictable guidelines for product support availability when a product releases and throughout that product’s life. By understanding the product support available, customers are better able to maximize the management of their IT investments and strategically plan for a successful IT future.

Microsoft provides support on the current service pack, and in some cases the immediately preceding service pack, for the products listed below. See the Lifecycle Support Policy FAQ for details on the Service Pack Support Policy. If you have any questions regarding support for a product, please contact your Microsoft representative. If you need technical support, visit the Contact Microsoft Web site.
The information on this page is subject to the Microsoft Policy Disclaimer and Change Notice. Return to this site periodically to review any such changes.


Source: Windows Phone 8.1 - Microsoft Support Lifecycle
 
I can't find any definite information even from MS Support whether my Lumia 520 will be upgradeable to Windows 10 mobile. This is a very common Windows phone and I'll be very disappointed if it isn't upgradeable.
 

My Computer

System One

  • OS
    Windows 8.1 64 bit
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Home Build
    CPU
    Intel i3570K
    Motherboard
    Gigabyte GA-77X-UD5H
    Memory
    16 GB
    Graphics Card(s)
    Sapphire R9 280X Toxic
    Sound Card
    Realtek on motherboard
    Monitor(s) Displays
    Viewsonic VP2770
    Screen Resolution
    2560 x 1440
    Hard Drives
    Intel 520 180GB SSD
    Seagate 2T HDD
    Seagate external 1T USB HDD
    PSU
    XFX 850W
    Case
    Nanoxia Deep Silence 1
    Cooling
    Noctua NH-D14
    Keyboard
    Microsoft
    Mouse
    Microsoft
    Internet Speed
    50Mbps
    Browser
    Chrome
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