Questions about abbyy cloud ocr

Error Installing ABBY OCR: "We cannot provide a billing estimate at this time. Please try again later. If this error persists, contact support with the following information. Offer Variant is not available in user's market"

Please refer ABBYY Cloud OCR SDK Service, it explains the pricing details of ABBYY Cloud OCR SDK Service on azure.
You may also checkout THIS, which discuss about same issue.

Crop or specify coordinates of the biggest rectangle in an image in Wp8

Please try to use the extension of WritableBitMap .

OCR(Optical Character Recognition) with C#, link or dll

You can try to check out this article about "Creating Optical Character Recognition (OCR) applications using Neural Networks" for reference - http://www.codeproject.com/dotnet/simple_ocr.asp

Read images in particular area to text

Visit this site: http://www.ocrtools.com/fi/Download.aspx

Optical Character Recognition SDK for wp 8.0 using c#?

For the Windows Phone 8, maybe you can try to refer to the following articles:
#OCR API for Windows Phone 8:
http://www.devscope.net/products/DevScopeOCR
http://stackoverflow.com/questions/16249525/ocr-api-for-windows-phone-8 .
https://github.com/charlesw/tesseract/issues/53 .
Then for the Windows Phone 8.1, please try to use the Microsoft's OCR library. It works for Windows Phone 8.1 runtime app. And it is available through the NuGet.
For more information, please try to refer to the following article:
#WindowsPhone 8.1 Optical Character Recognition(OCR) Library:
http://bsubramanyamraju.blogspot.kr/2014/08/windowsphone-81-optical-character.html.

Scanning text from old notes

Scanning letters as images, may require adjustments to scanner , for dpi resolution , an fine tuning color contrast,
use advanced scanner or check if your can scan at 600 dpi +
check color options even if letters are black on white,
save original scan as Tiff if able, and /or pdf export, scanner file if applicable,
if hand writing is clear and legible, you may be able to convert to text from OCR scan and save those files to edit as well,
once you have scans complete, place on cd/dvd as backup,
sd-card and usb memstick and cloud service,
Nuance - OmniPage
http://www.nuance.com/for-individuals/by...
ABBYY - OCR Fine reader
http://www.abbyy.com/
OCR iris
http://www.irislink.com/c2-532-189/OCR-S...
for originals, if still in envelopes, leave as is and place in archival box,
or open and place all sets in archival sleeves, then place in storage box,
http://www.warletters.com/preserve/index.html
http://www.webyfl.com/archival-paper-enclosures.aspx
http://www.webyfl.com/archival-boxes-containers.aspx

Other questions about OCR